This doesn't seem to be the case for me, maybe openssh version/configuration? Proof:
$ ssh -vvv root@labsdb1009.mgmt.eqiad.wmnet
OpenSSH_7.4p1 Debian-10+deb9u2, OpenSSL 1.0.2l 25 May 2017
debug1: Reading configuration data <FILTERED>
debug1: <FILTERED> line 1: Applying options for *
debug1: <FILTERED> line 15: Applying options for *.wmnet
debug1: Reading configuration data <FILTERED>
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug1: Executing proxy command: exec ssh -a -W labsdb1009.mgmt.eqiad.wmnet:22
bast1001.wikimedia.orgdebug1: permanently_drop_suid: 1000
debug1: identity file <FILTERED> type 1
debug1: key_load_public: No such file or directory
debug1: identity file <FILTERED>-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.4p1 Debian-10+deb9u2
debug1: Remote protocol version 2.0, remote software version mpSSH_0.2.1
debug1: no match: mpSSH_0.2.1
debug2: fd 5 setting O_NONBLOCK
debug2: fd 4 setting O_NONBLOCK
debug1: Authenticating to labsdb1009.mgmt.eqiad.wmnet:22 as 'root'
debug3: hostkeys_foreach: reading file "<FILTERED>"
debug3: record_hostkey: found key type RSA in file <FILTERED>
debug3: load_hostkeys: loaded 1 keys from labsdb1009.mgmt.eqiad.wmnet
debug3: order_hostkeyalgs: prefer hostkeyalgs:
ssh-rsa-cert-v01@openssh.com,rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug3: send packet: type 20
debug1: SSH2_MSG_KEXINIT sent
debug3: receive packet: type 20
debug1: SSH2_MSG_KEXINIT received
debug2: local client KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,
curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,ext-info-c
debug2: host key algorithms:
ssh-rsa-cert-v01@openssh.com,rsa-sha2-512,rsa-sha2-256,ssh-rsa,
ecdsa-sha2-nistp256-cert-v01@openssh.com,
ecdsa-sha2-nistp384-cert-v01@openssh.com,
ecdsa-sha2-nistp521-cert-v01@openssh.com,
ssh-ed25519-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519
debug2: ciphers ctos:
chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,
aes128-gcm@openssh.com,
aes256-gcm@openssh.com,aes128-cbc,aes192-cbc,aes256-cbc
debug2: ciphers stoc:
chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,
aes128-gcm@openssh.com,
aes256-gcm@openssh.com,aes128-cbc,aes192-cbc,aes256-cbc
debug2: MACs ctos:
umac-64-etm@openssh.com,
umac-128-etm@openssh.com,
hmac-sha2-256-etm@openssh.com,
hmac-sha2-512-etm@openssh.com,
hmac-sha1-etm@openssh.com,
umac-64@openssh.com,
umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc:
umac-64-etm@openssh.com,
umac-128-etm@openssh.com,
hmac-sha2-256-etm@openssh.com,
hmac-sha2-512-etm@openssh.com,
hmac-sha1-etm@openssh.com,
umac-64@openssh.com,
umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,
zlib@openssh.com,zlib
debug2: compression stoc: none,
zlib@openssh.com,zlib
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug2: peer server KEXINIT proposal
debug2: KEX algorithms: diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: host key algorithms: ssh-rsa,ssh-dss
debug2: ciphers ctos: aes256-ctr,aes256-cbc,aes128-cbc,3des-cbc
debug2: ciphers stoc: aes256-ctr,aes256-cbc,aes128-cbc,3des-cbc
debug2: MACs ctos: hmac-sha1,hmac-sha2-256,hmac-md5
debug2: MACs stoc: hmac-sha1,hmac-sha2-256,hmac-md5
debug2: compression ctos: none
debug2: compression stoc: none
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug1: kex: algorithm: diffie-hellman-group14-sha1
debug1: kex: host key algorithm: ssh-rsa
debug1: kex: server->client cipher: aes256-ctr MAC: hmac-sha2-256 compression: none
debug1: kex: client->server cipher: aes256-ctr MAC: hmac-sha2-256 compression: none
debug1: sending SSH2_MSG_KEXDH_INIT
debug2: bits set: 1000/2048
debug3: send packet: type 30
debug1: expecting SSH2_MSG_KEXDH_REPLY
debug3: receive packet: type 31
debug1: Server host key: ssh-rsa SHA256:<FILTERED>
debug3: hostkeys_foreach: reading file "<FILTERED>"
debug3: record_hostkey: found key type RSA in file <FILTERED>
debug3: load_hostkeys: loaded 1 keys from labsdb1009.mgmt.eqiad.wmnet
debug1: Host 'labsdb1009.mgmt.eqiad.wmnet' is known and matches the RSA host key.
debug1: Found key in <FILTERED>
debug2: bits set: 1008/2048
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey after 4294967296 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug3: receive packet: type 21
debug1: SSH2_MSG_NEWKEYS received
debug2: set_newkeys: mode 0
debug1: rekey after 4294967296 blocks
debug2: key: <FILTERED> (<FILTERED>), explicit, agent
debug2: key: <FILTERED> (<FILTERED>), agent
debug3: send packet: type 5
debug3: receive packet: type 6
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug3: send packet: type 50
debug3: receive packet: type 51
debug1: Authentications that can continue: password,publickey
debug3: start over, passed a different list password,publickey
debug3: preferred gssapi-keyex,gssapi-with-mic,publickey,keyboard-interactive,password
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Offering RSA public key: <FILTERED>
debug3: send_pubkey_test
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 51
debug1: Authentications that can continue: password,publickey
debug1: Offering RSA public key: <FILTERED>
debug3: send_pubkey_test
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 51
debug1: Authentications that can continue: password,publickey
debug2: we did not send a packet, disable method
debug3: authmethod_lookup password
debug3: remaining preferred: ,password
debug3: authmethod_is_enabled password
debug1: Next authentication method: password
root@labsdb1009.mgmt.eqiad.wmnet's password:
debug3: send packet: type 50
debug2: we sent a password packet, wait for reply
debug3: receive packet: type 52
debug1: Authentication succeeded (password).
Authenticated to labsdb1009.mgmt.eqiad.wmnet (via proxy).
debug1: channel 0: new [client-session]
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug3: send packet: type 90
debug1: Entering interactive session.
debug1: pledge: proc
debug3: receive packet: type 91
debug2: callback start
debug2: client_session2_setup: id 0
debug2: channel 0: request pty-req confirm 1
debug3: send packet: type 98
debug1: Sending environment.
debug3: Ignored env KDE_MULTIHEAD
debug3: Ignored env GS_LIB
debug3: Ignored env KDE_FULL_SESSION
debug1: Sending env LC_ALL = en_US.UTF-8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug3: Ignored env LS_COLORS
debug1: Sending env LANG = es_ES.UTF-8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug3: Ignored env DISPLAY
debug3: Ignored env PROFILEHOME
debug3: Ignored env SHELL_SESSION_ID
debug3: Ignored env COLORTERM
debug3: Ignored env XDG_VTNR
debug3: Ignored env SSH_AUTH_SOCK
debug3: Ignored env XDG_SESSION_ID
debug3: Ignored env USER
debug3: Ignored env DESKTOP_SESSION
debug3: Ignored env GTK2_RC_FILES
debug3: Ignored env PWD
debug3: Ignored env HOME
debug3: Ignored env SSH_AGENT_PID
debug3: Ignored env XCURSOR_SIZE
debug3: Ignored env QT_ACCESSIBILITY
debug3: Ignored env XDG_SESSION_TYPE
debug3: Ignored env XDG_DATA_DIRS
debug3: Ignored env KONSOLE_DBUS_SESSION
debug3: Ignored env XDG_SESSION_DESKTOP
debug3: Ignored env KONSOLE_DBUS_WINDOW
debug3: Ignored env TERM
debug3: Ignored env SHELL
debug3: Ignored env KONSOLE_DBUS_SERVICE
debug3: Ignored env XDG_SESSION_CLASS
debug3: Ignored env XDG_SEAT_PATH
debug3: Ignored env XCURSOR_THEME
debug3: Ignored env XDG_CURRENT_DESKTOP
debug3: Ignored env GPG_AGENT_INFO
debug3: Ignored env QT_LINUX_ACCESSIBILITY_ALWAYS_ON
debug3: Ignored env KONSOLE_PROFILE_NAME
debug3: Ignored env XDG_SEAT
debug3: Ignored env SHLVL
debug3: Ignored env COLORFGBG
debug3: Ignored env LANGUAGE
debug3: Ignored env GTK_RC_FILES
debug3: Ignored env WINDOWID
debug3: Ignored env LOGNAME
debug3: Ignored env DBUS_SESSION_BUS_ADDRESS
debug3: Ignored env XDG_RUNTIME_DIR
debug3: Ignored env XAUTHORITY
debug3: Ignored env XDG_SESSION_PATH
debug3: Ignored env QT_AUTO_SCREEN_SCALE_FACTOR
debug3: Ignored env PATH
debug3: Ignored env KDE_SESSION_UID
debug3: Ignored env KDE_SESSION_VERSION
debug3: Ignored env SESSION_MANAGER
debug3: Ignored env _
debug2: channel 0: request shell confirm 1
debug3: send packet: type 98
debug2: callback done
debug2: channel 0: open confirm rwindow 1048576 rmax 2048
debug3: receive packet: type 99
debug2: channel_input_status_confirm: type 99 id 0
debug2: PTY allocation request accepted on channel 0
debug3: receive packet: type 99
debug2: channel_input_status_confirm: type 99 id 0
debug2: shell request accepted on channel 0
User:root logged-in to ILOMXQ62005Z0.(<FILTERED>)